mm/rmap.c: remove redundant variable cend

mm/rmap.c: remove redundant variable cend

Variable cend is set but never read, hence it is redundant and can be
removed.

Cleans up clang build warning: Value stored to 'cend' is never read

Link: http://lkml.kernel.org/r/[email protected]
Fixes: 369ea8242c0f ("mm/rmap: update to new mmu_notifier semantic v2")
Signed-off-by: Colin Ian King <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>